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      <title>Topic和Tag的区别与用途 - 交互式测验</title>
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    <body>
      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>Topic和Tag的区别与用途 - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
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                    <div class="progress-bar">
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      <script>
        const quizData = [
  {
    "question": "在RocketMQ中，Topic的核心定义是什么？",
    "options": [
      "一个物理存储节点，专门用于存放特定类型的消息。",
      "消息的一级分类，是生产者和消费者交互的基本单位。",
      "管理所有Broker和Topic元数据的中心组件。",
      "消息的二级分类，用于在Topic内部进行消息过滤。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "根据文档，Topic是RocketMQ中消息的一级分类，是生产者发送消息和消费者订阅消息的最基本单位。所有消息都必须归属于一个特定的Topic。其他选项描述的是Broker（物理节点）、NameServer（元数据管理）或Tag（二级分类）。",
    "source": "文档中「Topic的概念和作用」->「Topic的基本概念」部分",
    "hint": "文档开头就定义了Topic是消息的...？思考它在分类体系中的层级。"
  },
  {
    "question": "根据文档，RocketMQ中哪个组件负责管理和提供Topic的路由信息？",
    "options": [
      "Broker",
      "Producer",
      "NameServer",
      "Consumer"
    ],
    "correctAnswerIndex": 2,
    "explanation": "文档明确指出，Topic的路由信息（包括它所在的Broker、队列数量等元数据）由NameServer管理。生产者和消费者都需要通过查询NameServer来获取这些信息，以便知道向哪里发送消息和从哪里拉取消息。",
    "source": "文档中「Topic的概念和作用」->「Topic的物理结构」->「路由管理」部分",
    "hint": "哪个组件是RocketMQ的'注册中心'或'大脑'，负责维护集群的元数据？"
  },
  {
    "question": "在RocketMQ的消息分类体系中，Tag扮演了什么角色？",
    "options": [
      "它是一个独立的物理队列，用于隔离不同类型的消息。",
      "它是一个用于权限控制的令牌，与消息分类无关。",
      "它是消息的一级分类，一个Tag可以包含多个Topic。",
      "它是消息的二级分类，用于在同一个Topic下对消息进行更细粒度的划分。"
    ],
    "correctAnswerIndex": 3,
    "explanation": "Tag是RocketMQ中消息的二级分类，它附加在Topic之上。其主要作用是在一个共同的Topic下，对消息进行更精细的区分和过滤，例如在一个'订单Topic'下区分'创建订单'和'支付订单'的消息。Tag是逻辑分类，不创建物理队列。",
    "source": "文档中「Tag的使用方式和优势」->「Tag的基本概念」部分",
    "hint": "如果Topic是一级分类，那么Tag在层级上处于什么位置？"
  },
  {
    "question": "从资源和扩展成本的角度来看，创建新的Topic和添加新的Tag之间最主要的区别是什么？",
    "options": [
      "创建Topic成本较高，因为它需要创建独立的物理队列；而添加Tag成本较低，因为它只是消息的一个元数据标记。",
      "添加Tag的成本更高，因为它需要修改Broker的底层存储结构。",
      "两者成本相近，都需要向NameServer注册新的元数据。",
      "创建Topic是客户端行为，成本低；添加Tag是服务端行为，成本高。"
    ],
    "correctAnswerIndex": 0,
    "explanation": "文档中的对比分析表明确指出，Topic具有物理隔离性，创建它意味着要创建独立的物理队列，因此扩展成本较高。相比之下，Tag是逻辑分类，不创建额外的存储结构，只是作为消息的属性存在，因此扩展成本非常低。",
    "source": "文档中「对比分析」表格中的「物理隔离」、「存储影响」和「扩展成本」行",
    "hint": "思考一下哪个是'物理'层面的变更，哪个是'逻辑'层面的变更？"
  },
  {
    "question": "以下哪个业务场景最适合使用Tag来进行消息分类，而不是创建一个新的Topic？",
    "options": [
      "需要将高并发的'交易消息'与低频率的'系统通知消息'进行物理隔离。",
      "在一个'订单Topic'中，区分'创建订单'、'支付订单'和'取消订单'这几种不同的操作。",
      "为'敏感操作日志'和'普通应用日志'设置不同的消息存储周期。",
      "区分'订单系统'和'库存系统'这两个完全独立的业务领域的消息。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "文档指出，Tag的典型应用场景是用于区分'同一业务的不同操作类型'。订单处理是统一的业务领域（对应一个Topic），其内部的创建、支付、取消等不同操作阶段，非常适合用Tag来细分。而其他选项描述了不同业务域、不同性能要求或不同存储策略的场景，这些更适合使用独立的Topic来做物理隔离。",
    "source": "文档中「Topic和Tag在消息分类中的不同应用场景」->「使用Tag的典型场景」部分",
    "hint": "Tag适用于'同一业务领域'内的细分，哪个选项符合这个描述？"
  },
  {
    "question": "使用Tag进行消费端过滤带来的主要好处是什么？",
    "options": [
      "生产者发送消息时可以获得更高的吞吐量。",
      "可以从根本上减少Broker的存储压力。",
      "消费者可以只订阅和处理自己感兴趣的消息子集，从而提高消费效率。",
      "可以动态增加Broker节点而无需修改消费者代码。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "Tag的一个核心优势是支持消费端过滤。消费者在订阅Topic时可以指定感兴趣的Tag，这样Broker在投递消息时只会传递带有匹配Tag的消息。这避免了消费者接收并处理大量无关消息，从而显著提高消费端的处理效率。",
    "source": "文档中「Tag的使用方式和优势」->「Tag的核心优势」->「消费端过滤」部分",
    "hint": "想想看，如果一个消费者只关心'支付成功'的消息，Tag如何帮助它避免处理'创建订单'的消息？"
  },
  {
    "question": "根据文档中的最佳实践，关于Topic和Tag的规划，哪项描述是正确的？",
    "options": [
      "应尽可能多地创建Topic以实现最强的隔离性，避免使用Tag。",
      "Tag的规划比Topic更重要，因为它是消息分类的核心。",
      "Topic和Tag都可以随时随意添加，因为RocketMQ的扩展性很好。",
      "Topic的结构调整成本高，应预先规划；而Tag可以灵活添加，以适应业务演进。"
    ],
    "correctAnswerIndex": 3,
    "explanation": "文档中的'前瞻性规划'部分强调，Topic的结构调整成本较高，因为它涉及到物理资源，所以应该在系统设计初期进行合理规划。而Tag的添加则非常灵活，成本低，可以随着业务的发展动态增加，非常适合系统的后续演进和扩展。",
    "source": "文档中「对比分析」->「最佳实践」->「前瞻性规划」部分",
    "hint": "哪一个实体的变更成本更高，因此需要更谨慎的前期规划？"
  }
];
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            const wrongCount = answeredCount - correctCount;
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                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

            let reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  